So far, so good. I bought these as a replacement ballast for use in a 1995 Sunquest Pro 16S solarium. I had to switch a bit to get them working, but it wasn't that hard. The original ballast operated 2 bulbs each, the SunHorse ballast will operate 4 bulbs each. I ended up replacing all 4 top ballasts with 2 SunHorse ballasts. They are much longer than the original ballast but the solarium mounting channel can be repositioned to accommodate them. In addition, changing the wiring is easy and the circuit is located directly on the ballast. I've only been using them for a few weeks so can't comment on product durability, but both worked great right out of the box.
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